Conclusions
There is much anticipation that there will be significant
progress in our understanding of pheromone guided
behaviors in the next few years, and Drosophila as a model
system will undoubtedly be at the forefront in this
endeavor. Two pressing issues will need to be addressed
to make such progress possible. First, we need to identify
all the PRs that trigger the particular behavioral
responses, a feat that has become straightforward with
the identification of candidate gene families. Second, only
the identity of the central targets of PR neurons in the
brain and the ganglia in the thorax can lead us to the
neural circuits that control these behaviors. At least
the primary centers of pheromone processing should be
revealed rather quickly once the receptors have been
identified, as the central targets of olfactory and gustatory
neurons can be visualized directly with appropriate markers
and techniques